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Why does my feed line not have pressure until my 1st zone valve is one?

I'm trying to get a pressure line off of my sprinker system. I tied into the presure line in front of the zone valve on the feed side. The problem is the water is not supplied unitl the 1st zone comes on. My system has 8 zones and I'm working on the #8 zone. What can I do to get a constant line of water?